Abstract
Abstract Effects of chlormequat chloride (CCC), ethephon and mixtures of CCC and ethephon, applied at Zadoks growth stage (ZGS) 30 (the beginning of stem elongation) on the number of spike‐bearing shoots and their contribution to grain yields of four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada. The results varied between years and among cultivars. The mixtures of CCC and ethephon or ethephon alone, produced significant increases in the number of spikes m −2 in cultivars Joly and Laurier , in both years, and in Leger only in 1988. Ethephon and ethephon containing mixtures reduced the yields of Joly and Leger in 1988. In both years CCC had no effect on spikes m −2 for all cultivars. Increases in spikes m −2 were accompanied by decreases in 1000‐grain weight, and/or grains per spike, which offset or more than offset potential benefits from increased spikes m −2 . These results indicate that under continental climatic conditions such as those prevalent in Quebec, Canada, application of PGRs to spring barley at ZGS 30 does not increase grain yield through an increased number of spikes m −2 .
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Claims 6
Claim · model-written summary
Mixtures of CCC and ethephon, or ethephon alone, significantly increased spikes per square metre in Joly and Laurier in both years.
- Taxon
- spring barley
.jpg?width=60)
Hordeum vulgaree0 - Material
- Joly and Lauriere1
- Treatment
- mixtures of CCC and ethephon or ethephon alonee1
- Outcome
- number of spikes m −2e1
- Direction
- increasese1
- Qualifier
- in both yearse1
- Setting
- McGill University, Quebec, Canadae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada”
e1“The mixtures of CCC and ethephon or ethephon alone, produced significant increases in the number of spikes m −2 in cultivars Joly and Laurier , in both years, and in Leger only in 1988”
Claim · model-written summary
Mixtures of CCC and ethephon, or ethephon alone, significantly increased spikes per square metre in Leger in 1988.
- Taxon
- spring barleyHordeum vulgaree0
- Material
- Legere1
- Treatment
- mixtures of CCC and ethephon or ethephon alonee1
- Outcome
- number of spikes m −2e1
- Direction
- increasese1
- Qualifier
- only in 1988e1
- Setting
- McGill University, Quebec, Canadae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada”
e1“The mixtures of CCC and ethephon or ethephon alone, produced significant increases in the number of spikes m −2 in cultivars Joly and Laurier , in both years, and in Leger only in 1988”
Claim · model-written summary
Ethephon and ethephon-containing mixtures reduced the yields of Joly and Leger in 1988.
- Taxon
- spring barleyHordeum vulgaree0
- Material
- Joly and Legere2
- Treatment
- Ethephon and ethephon containing mixturese2
- Outcome
- yieldse2
- Direction
- reducede2
- Qualifier
- in 1988e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada”
e2“Ethephon and ethephon containing mixtures reduced the yields of Joly and Leger in 1988”
Claim · model-written summary
CCC had no effect on spikes per square metre in either year for any cultivar.
- Taxon
- spring barleyHordeum vulgaree0
- Treatment
- CCCe3
- Outcome
- spikes m −2e3
- Direction
- had no effecte3
- Qualifier
- In both yearse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada”
e3“In both years CCC had no effect on spikes m −2 for all cultivars”
Claim · model-written summary
Increases in spikes per square metre were accompanied by decreases in 1000-grain weight and/or grains per spike in spring barley.
- Taxon
- spring barleyHordeum vulgaree0
- Treatment
- Increases in spikes m −2e4
- Outcome
- 1000‐grain weighte4
- Direction
- decreasese4
- Qualifier
- and/or grains per spikee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four spring barley ( Hordeum vulgare L.) cultivars were studied in 1987 and 1988 at McGill University, Quebec, Canada”
e4“Increases in spikes m −2 were accompanied by decreases in 1000‐grain weight, and/or grains per spike, which offset or more than offset potential benefits from increased spikes m −2”
Claim · model-written summary
Application of PGRs at ZGS 30 does not increase spring barley grain yield through an increased number of spikes per square metre under continental climatic conditions.
- Taxon
- spring barleyHordeum vulgaree5
- Treatment
- PGRse5
- Outcome
- grain yielde5
- Direction
- does not increasee5
- Qualifier
- through an increased number of spikes m −2e5
- Setting
- continental climatic conditionse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“under continental climatic conditions such as those prevalent in Quebec, Canada, application of PGRs to spring barley at ZGS 30 does not increase grain yield through an increased number of spikes m −2”
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See all 40 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.